Safety and Treatment Satisfaction in Adults With Chronic ITP After Switching to Avatrombopag From Eltrombopag or Romiplostim

Prospective, Multi-center, Open-label Study Measuring Safety and Treatment Satisfaction in Adult Subjects With Chronic Immune Thrombocytopenia (ITP) After Switching to Avatrombopag From Eltrombopag or Romiplostim

Evaluate the safety and tolerability of avatrombopag given for 90 days after stopping treatment with eltrombopag or romiplostim.

This Phase 4, prospective, multi-center, open-label study will evaluate safety, platelet count, and subject reported medication satisfaction in adult subjects with chronic ITP after switching to avatrombopag from eltrombopag or romiplostim. At least 100 subjects will be enrolled, 50 (±10) who have received eltrombopag and 50 (±10) who have received romiplostim for at least 90 days prior to study entry.

Inclusion Criteria:

• Subject has been undergoing treatment for primary ITP with eltrombopag or romiplostim for at least 90 days prior to the Screening Visit/Visit 1.
• Subject has had a previous response (at any time) to either eltrombopag or romiplostim, defined as at least 2 platelet counts ≥50×10⁹/L. Subject is willing and able to comply with all aspects of the protocol, including completing the self-administered Treatment Satisfaction Medication Questionnaire (TSQM).

Exclusion Criteria:

• Subject is currently receiving chemotherapy or radiation for any form of cancer.
• Subject with conditions that are likely to prevent them from accurately and reliably completing study assessments, including evidence of moderate to severe dementia, and/or severe and progressive medical illness, as determined by the Investigator.
• Any previous avatrombopag use.
• Previous participation in this study; a subject may not re-enroll after prior discontinuation or completion.
• Enrollment in another clinical study with any investigational drug or device within 30 days of Baseline (or 5 half-lives, whichever is longer); however, participation in observational studies within the previous 30 days is permitted.